Abstract:
A performance evaluation system for a multiple-input multiple-output (MIMO) antenna system receives simulation parameters from an input device, and simulates a MIMO antenna system accordingly. A method, also provided, further evaluates performance of the simulated MIMO antenna system when a series of radio frequency (RF) signals are transmitted through the MIMO antenna system, and displays a performance analysis result of the MIMO antenna system on a display device for evaluation of the performance of the simulated MIMO antenna system.
Abstract:
Parameters of a radio frequency filter can be changed by changing structure of each component of the filter. Material of each component, diameters of each of magnetic cylinders, density of each of conductive coils, thickness of a dielectric layer, and thickness of an insulation tube can be changed. When any component needs to be replaced, each cover is rotated, with connection partitions move to two slots of a resisting portion, to detach the filter.
Abstract:
A test probe includes a filtering unit and a contact unit. The filtering unit includes an inductive component, a capacitive component, and an insulation component insulates the inductive component from the capacitive component. The contact unit contacts a test point to get a test signal. The filtering unit filters noise from the test signal. The test probe can be assembled and disassembled easily, and parameters of the filtering unit can be changed by changing structure of each component.
Abstract:
A system and method generates a test file of a print circuit board (PCB). The system and method loads trace information of the PCB into a storage system of a test computer, searches the storage system for the trace information matching keywords received and selects traces to test from the searched results. The system and method further acquires length and test points of each selected trace, and sets test parameters of each test item. In addition, the system and method generates a test file of the PCB according to the test parameters, the length, and the test points of each selected trace.
Abstract:
A method for defining a stepped hole in a printed circuit board (PCB) by drilling layers of the PCB by different sized drill bits along a same axis. The stepped hole in the layers of the PCB are decreased in diameters sequentially.
Abstract:
A motherboard layout method includes positioning two electronic elements on a top layer of a motherboard, and positioning another two electronic elements on a bottom layer of the motherboard, connecting one end of a first electronic element on the top layer to the same end of a first electronic element on the bottom layer with a first via hole, and connecting the same end of a second electronic element on the top layer to the same end of a second electronic element on the bottom layer with a second via hole. The method further includes connecting the other ends of the two electronic elements on the top layer to a first part, and connecting the other ends of the two electronic elements on the bottom layer to a second part.
Abstract:
A system, storage medium, and method for structuring data are provided. The system connects to a storage device that stores original data. The method obtains the original data from the storage device, and stores the original data in the form of character strings into a buffer memory according to end of file-line (EOF) tags. The method further constructs data arrays to store the character strings, and arranges each of the data arrays into a data matrix. In addition, the method classifies each of the data arrays in the data matrix according to properties of the character strings, arranges the classified data arrays into a data file, and stores the data file into the buffer memory.
Abstract:
An equalizer includes a first resistor and a capacitor connected in parallel. The positive terminal of the capacitor is connected to a signal transmission line on a blah printed circuit board. The negative terminal of the capacitor is connected to ground through a second resistor. A connector including the equalizer and a printed circuit board including the connector are also provided.
Abstract:
A design method of printed circuit boards includes the following steps. First, simulate a printed circuit board including power layers, and vias connected to all the power layers. Then, change connections of the vias that tend to draw too much current to be connected to fewer power layers, than the vias that tend to draw less current. Repeat adjusting connections of the vias until all vias draw a similar amount of current such that no via draws more current than an upper limit the vias are designed for. Finally, according to the results, design/fabricate a PCB with vias respectively insulated, as needed, from the power layers that do not need to be connected to the vias.
Abstract:
A printed circuit board (PCB) includes a power layer having a base portion, and at least two extending portions. The at least two extending portions are extended from edges near at least one corner of the base portion for preventing the PCB from forming constructive interferences and lowering the resonance magnitude thereof.